Talk:Hagen–Poiseuille flow from the Navier–Stokes equations
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Hagen-poiseuille equation;
See equation 7 of
Three approaches to calculating the velocity profile of a laminar incompressible fluid flow in a hollow tube
C. Neipp1, A. Hernández1, T. Beléndez2, J. J. Rodes1, and A. Beléndez1 1Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante, E-03080 Alicante, Spain 2Departamento de Ciencia y Tecnología de los Materiales, Universidad Miguel Hernández de Elche, Avda. del Ferrocarril, s/n. E-03202 Elche Alicante, Spain
the other steps are correct ( I think)
Jgreeter (talk) 02:35, 5 May 2011 (UTC)
- I do not see anything wrong with the 'equation for pressure drop' provided in the article. Please explain if you found it incorrect. Salih (talk) 03:51, 5 May 2011 (UTC)
Pressure gradient
edit"Assuming that the pressure decreases linearly across the length of the pipe, we have (constant)"
This sentence is actually imprecise. By the z-component of the equation of motion
,
indeed, the pressure gradient must be constant, since – by incompressibility – the left-hand side is a function of only, and the right-hand side is a function of only. — Preceding unsigned comment added by Aspro89 (talk • contribs) 12:29, 4 December 2017 (UTC)